论文部分内容阅读
为研究悬链线效应下锚固钢筋与混凝土之间的黏结破坏,以及在RC框架结构连续性倒塌过程中钢筋拉断和黏结失效的先后顺序,分析锚固长度、钢筋布置方式对黏结锚固性能的影响。将钢筋锚固于钢筋混凝土柱中,通过自制的自平衡加载装置,实现对框架结构梁端破坏而钢筋未拉断时形成悬链线受力机制的钢筋进行加载。试验结果表明:锚固钢筋与混凝土之间发生劈裂破坏,而锚固钢筋并没有被拉断,所以在RC框架结构抗倒塌设计中不宜采用直锚的锚固形式,而应该采用其他有效的锚固形式。此外,单排钢筋布置有利于提高锚固钢筋与混凝土之间的平均黏结应力,较双排钢筋布置下的约提高15%。
In order to study the bond failure between anchorage bar and concrete under catenary effect and the order of bar breakage and bond failure during the continuous collapse of RC frame structure, the influence of anchorage length and reinforcement arrangement on bond and anchorage performance . The steel bar is anchored in the reinforced concrete column, and the self-balanced self-balance loading device is used to load the steel bar which forms the catenary force mechanism when the steel bar is broken when the steel bar is broken. The test results show that the splitting failure occurs between the anchorage bar and the concrete, and the anchorage bar is not pulled off. Therefore, it is not appropriate to adopt the anchoring method of straight anchors in the RC frame structure design, and other effective anchoring forms should be adopted. In addition, the arrangement of single row of steel bars helps to increase the average bond stress between anchor steel bars and concrete, which is about 15% higher than that of double-row steel bars.